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The velocity-time graph in the figure below illustrates the motion of a ball which has been projected vertically upwards from the surface of the moon....
(Solved)
The velocity-time graph in the figure below illustrates the motion of a ball which has been projected vertically upwards from the surface of the moon. The weight of the object on earth’s surface is 20N, when the acceleration due to gravity is 10ms-2.
(i) State why the velocity becomes negative after 3seconds.
(ii) Determine the acceleration of free fall on the moon showing clearly your work
(iii) Determine the total distance travelled by the ball in 5.0sec
(iv) Find the weight of the ball on the moon
Date posted:
April 4, 2019
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Answers (1)
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Figure below shows a car with a dummy driver before and after a collision test:
(Solved)
Figure below shows a car with a dummy driver before and after a collision test:
The mass of the dummy driver is 90kg. The impact time to reduce the dummy’s speed from
45m/s to zero is 1.2 seconds:
(i) Calculate the average force on the dummy during impact
(ii) State the main energy transformation during the collision
(iii) Calculate how much of the dummy’s energy is transformed during the collision
Date posted:
April 4, 2019
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Answers (1)
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The figure below shows a uniform bar of length 1.0m pivoted near one end. The bar is kept in equilibrium by a spring balance as...
(Solved)
The figure below shows a uniform bar of length 1.0m pivoted near one end. The bar is kept in equilibrium by a spring balance as shown:
Given that the reading of the spring balance is 0.6N, determine the reaction force at the pivot.
Date posted:
April 4, 2019
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Answers (1)
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The diagram below shows a ball being whirled in a vertical plane.
(Solved)
The diagram below shows a ball being whirled in a vertical plane.
Date posted:
April 4, 2019
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Answers (1)
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The diagram below shows a velocity – time graph of a certain motion.
(Solved)
The diagram below shows a velocity – time graph of a certain motion.
From the graph, determine the average speed of the body.
Date posted:
April 4, 2019
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Answers (1)
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A bullet of mass 150g moving at an initial velocity of 80m/s strikes a suspended block
of mass 2.5kg
(Solved)
A bullet of mass 150g moving at an initial velocity of 80m/s strikes a suspended block
of mass 2.5kg
(a)The block swings from point A to B. Determine the vertical displacement between A and B
(b) What observations are you likely to observe on the block after collision
Date posted:
April 4, 2019
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Answers (1)
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One end of a metal rod is heated in a flame. After some time the other end becomes hot.
Explain this observation
(Solved)
One end of a metal rod is heated in a flame. After some time the other end becomes hot.
Explain this observation
Date posted:
April 4, 2019
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Answers (1)
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The figure below shows a section of a ticker tape. The dots were made at a frequency of 50 Hz.
Determine the acceleration of the trolley...
(Solved)
The figure below shows a section of a ticker tape. The dots were made at a frequency of 50 Hz.
Determine the acceleration of the trolley pulling the tape.
Date posted:
April 4, 2019
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Answers (1)
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Distinguish between the terms ‘uniform velocity’ and ‘uniform acceleration’
(Solved)
Distinguish between the terms ‘uniform velocity’ and ‘uniform acceleration’
Date posted:
April 4, 2019
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Answers (1)
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When a load of 20N is hung from a spring, the spring has a length of 15 cm. The same spring
has a length of 17...
(Solved)
When a load of 20N is hung from a spring, the spring has a length of 15 cm. The same spring
has a length of 17 cm when supporting a load of 25N. Determine the spring length when
supporting no load.
Date posted:
April 4, 2019
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Answers (1)
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Three identical springs with proportionality constant of 50N/m. each are connected as shown
below and support a load of 60N
(Solved)
Three identical springs with proportionality constant of 50N/m. each are connected as shown
below and support a load of 60N
Calculate;
(a) The extension in one spring
(b) The extensive proportionality constant of the springs
Date posted:
April 4, 2019
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Answers (1)
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A single light spring extends by 3.6cm when supporting a load of 2.5kg. What is the total
extension in the arrangement shown below. (Assume the springs...
(Solved)
A single light spring extends by 3.6cm when supporting a load of 2.5kg. What is the total
extension in the arrangement shown below. (Assume the springs are identical)
Date posted:
April 4, 2019
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Answers (1)
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Sketch a graph of length of a helical spring against compressing force until the coils of the
spring are in contact
(Solved)
Sketch a graph of length of a helical spring against compressing force until the coils of the
spring are in contact
Date posted:
April 4, 2019
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Answers (1)
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The following results were recorded in an experiment where different masses were hung on the end of a long spring whose other end was firmly...
(Solved)
The following results were recorded in an experiment where different masses were hung on the end of a long spring whose other end was firmly fixed. The length of the spring and the mass hanging from it were recorded as below. Original length of spring was 40cm.
(a) Complete the table for load and corresponding extensions
(b) Plot a graph of extension of the spring against load on the spring on the grid provided
(c) Determine the spring constant using the linear section of the graph
(d) Give an explanation why the slope of the graph changes when a mass greater than 0.75kg is attached to the spring
(e) From the list of quantities below, select quantities that are vector quantities:-
speed, density, force, acceleration and current
Date posted:
April 4, 2019
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Answers (1)
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Sea water of density 1.04g/cm3 is being pumped into a tank through a pipe of uniform cross-sectional area of 3.142cm2. If the speed of water...
(Solved)
Sea water of density 1.04g/cm3 is being pumped into a tank through a pipe of uniform cross-sectional area of 3.142cm2. If the speed of water in the pipe is 5m/s, determine the volume flux in S.I units
Date posted:
April 4, 2019
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Answers (1)
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The figure below shows a light body floating in a container
(Solved)
The figure below shows a light body floating in a container
State and explain the observation when a stream of air is blown over the mouth of the container
as shown
Date posted:
April 4, 2019
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Answers (1)
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The diagram below figure shows a cross- section of an aeroplane wing. When the aeroplane is moving at a constant height and constant speed, an...
(Solved)
The diagram below figure shows a cross- section of an aeroplane wing. When the aeroplane is moving at a constant height and constant speed, an upward force is exerted on its wing.
What is the cause of the upward force?
Date posted:
April 4, 2019
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Answers (1)
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In the diagram in figure, water flows through a section of a pipe whose diameter changes as shown
(Solved)
In the diagram in figure, water flows through a section of a pipe whose diameter changes as shown
Sketch a graph of the variation of pressure along the line ABCD.
Date posted:
April 4, 2019
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Answers (1)
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The diagram below shows a section of a pipe with different cross – sectional area.
(Solved)
The diagram below shows a section of a pipe with different cross – sectional area.
If water flows with a velocity of 5m/s in section P, what would be the velocity of water in section Q if the cross sectional areas are as shown?
Date posted:
April 4, 2019
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Answers (1)
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Figure below shows the cross-section of an aerofoil, with the aeroplane moving in the direction shown by the arrow.
(Solved)
Figure below shows the cross-section of an aerofoil, with the aeroplane moving in the direction shown by the arrow.
Sketch the streamlines to show how air flows past the wing as the aeroplane moves
Date posted:
April 4, 2019
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Answers (1)